postfix / dovecot / roundcube: «Не удалось подключиться к серверу хранения»

Я установил roundcube в окне Debian согласно инструкциям здесь: https://www.server-world.info/en/ note? os = Debian_10 & p = httpd & f = 14

При попытке войти в веб-интерфейс я получаю сообщение «Ошибка подключения к серверу хранения». При использовании команды openssl я могу войти в систему удаленно с помощью аутентификационный вход в порядке. И когда я удаленно выбираю папку «Входящие», почтовые ящики автоматически создаются в каталоге пользователя. Таким образом, между roundcube и dovecot должно быть некоторое отключение.

регистрирует примерно 3 раза за каждую неудачную попытку на roundcube:

Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x10, ret=1: before SSL initialization
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: before SSL initialization
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: before SSL initialization
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: before SSL initialization
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS read client hello
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write server hello
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write certificate
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write key exchange
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write server done
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3/TLS write server done
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3/TLS write server done
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3/TLS write server done
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write server done
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS read client key exchange
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS read change cipher spec
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS read finished
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write session ticket
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write change cipher spec
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3/TLS write finished
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x20, ret=1: SSL negotiation finished successfully
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL: where=0x2002, ret=1: SSL negotiation finished successfully
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL alert: close notify
Oct  5 18:44:47 mail dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=xxx.xxx.xxx.xxx, lip=xxx.xxx.xxx.xxx, TLS, session=<wJBr4PCwYrQD5UF7>
Oct  5 18:44:47 mail dovecot: imap-login: Debug: SSL alert: close notify

Конфигурация Roundcube:

$config = array();
$config['default_host'] = 'tls://example.com';
$config['smtp_server'] = 'tls://example.com';
$config['smtp_port'] = 587;
$config['smtp_user'] = '%u';
$config['smtp_pass'] = '%p';
$config['support_url'] = '';
$config['product_name'] = 'Webmail';
$config['des_key'] = 'abcd1234';
$config['plugins'] = array(
);
$config['skin'] = 'larry';
$config['enable_spellcheck'] = false;
$config['default_port'] = 143;
$config['smtp_auth_type'] = 'LOGIN';
$config['smtp_helo_host'] = 'mail.smartlu63.org';
$config['main_domain'] = 'smartlu63.org';
$config['useragent'] = 'Union Webmail';
$config['imap_conn_options'] = array( 'ssl' => array( 'verify_peer' => true, 'CN_match' => 'smartlu63.org', 'allow_self_signed' => true, 'ciphers' => 'HIGH:!SSLv2:!SSLv3',),);

Конфигурация Dovecot

auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = yes
disable_plaintext_auth = no
mail_debug = yes
mail_location = maildir:~/Maildir
mail_privileged_group = mail
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  driver = pam
}
plugin {
  sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = " imap pop3"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
ssl_cert = </etc/dovecot/private/dovecot.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
userdb {
  driver = passwd
}
verbose_ssl = yes

Примечание: я удалил пакет sieve, чтобы попытаться минимизировать сложность конфигурации.